What exactly is the structure of DNA and what may be the proper vocabulary to call this structure. One need to know word is the double helix. The double helix is a ladder like structure and its proper name is the double helix because scientist can't go around saying the twisty ladder. The next words are the adenine and the thymine are always paired up in the structure.
What are Punnet squares? Punet squares are what are used calculate Geneology. They help find possibilities of what the phenotype what the baby may look like. Scientist draw a square and on the outside are letters. Those letters are the genotypes of the parents. A woman is XX. A man is XY. Those are used to calculate whether there will be a boy or a girl. This can also be used on plants and animals.
The scientist use punnet squares to determine a lot. They use it to determine the Phenotype of the child. This is used by scientist everywhere. It is very common. For example: a man is DD, for dimples and a woman is dd, for no dimples. The child gets dimples because The father is dominant. In science we were learning about genealogy. We did a paper pet family. The paper pet family helped me learn a lot. I learned that genes mostly come from your parents. It only comes from a grandparent if it skips a generation. Genes are determined on whether you parents have, for example: a dark haired man and a light haired woman. The man is homozygous and the woman is homozygous. Homozygous means that they have the same gene.
The male is DD. The woman is dd. The children would have to be heterozygous and would be Dd. That is one thing I learned from the Paper Pet Family project. Another thing I learned from the Paper Pet Family project was that you phenotype, the way you look, is determined on the way your parents genotypes. How did peppered moths get to be their color? What color were they before? The peppered moths were, as their name presumes them, a peppered color and they lived in England. When England turned to an industrial era the trees became black. The peppered moths became too light for the trunks, and they were eaten by preditors. Some changed color to match the trunks because it was in their genes.
The ones that didn't either left the industrial site or were eaten. The ones that didn't have the black color in their genes were eaten by their predator, the bird. The black ones were safe near the industrial site. The peppered moths moved away. How does over population and limited recourses create competition between animals? Well, some animals have to fight for food because their food is being destroyed in some areas. The frog may not have enough flies to digest. That's what causes extinction and evolution. When the insect stops going where the frogs are then the frogs are then the frog doesn't eat for a while. This is where either the frog moves of then they start to die off.
This is also where competition comes in. If the animal moves to another spot or some other animal moves in it will become a competition of the fittest. Only the strong will win. The frog that doesn't eat will become starved and may die off. This will prevent that animal from reproducing in that area. The animal may die but that other animal that was already there will reproduce. That animal that was reproduced may move to a different spot. That animal may die off in the end because that isn't it's regular habitat. | TatumThis is my science blog page and here you will read what I have learned in science class. ArchivesJune 2013 Categories |
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